It's easy to become confused about these terms: advertising, marketing, promotion, public relations, publicity and sales.
The terms are often used interchangeably. However, they refer to different -- but similar activities.
Some basic definitions are provided in this short podcast article as read by Michael Searles from the same article published online at his Social Media Channel.
A short example is also provided hopefully to help make the terms more clear to you the listener.
Oh, the elephant? Well, you will just need to listen to find out.